Gab Social. All are welcome.

app/controllers/concerns/localized.rb

@@ -0,0 +1,42 @@
+# frozen_string_literal: true
+
+module Localized
+  extend ActiveSupport::Concern
+
+  included do
+    before_action :set_locale
+  end
+
+  private
+
+  def set_locale
+    I18n.locale = default_locale
+    I18n.locale = current_user.locale if user_signed_in?
+  rescue I18n::InvalidLocale
+    I18n.locale = default_locale
+  end
+
+  def default_locale
+    if ENV['DEFAULT_LOCALE'].present?
+      I18n.default_locale
+    else
+      request_locale || I18n.default_locale
+    end
+  end
+
+  def request_locale
+    preferred_locale || compatible_locale
+  end
+
+  def preferred_locale
+    http_accept_language.preferred_language_from(available_locales)
+  end
+
+  def compatible_locale
+    http_accept_language.compatible_language_from(available_locales)
+  end
+
+  def available_locales
+    I18n.available_locales.reverse
+  end
+end